This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A271247 #4 Apr 02 2016 21:23:46 %S A271247 14197,21617,25801,24977,25999 %N A271247 Erroneous version of A270800. %C A271247 The correct third term is 23801, not 25801 as given in [Lehmer]. %H A271247 E. Lehmer, <a href="http://dx.doi.org/10.1016/0022-247X(66)90145-4">Artiads characterized</a>, J. Math. Anal. Appl. 15 1966 118-131. %K A271247 dead %O A271247 1,1